<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="头像">
      </div>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" :rules="loginForm_Rules" :model="loginForm" label-width="0px" class="login_form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!--按钮-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  components: {

  },
  data () {
    return {
      // 用户数据
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 验证规范
      loginForm_Rules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 表单重置按钮事件
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 表单预验证
      this.$refs.loginFormRef.validate(async valId => {
        if (!valId) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败');
        this.$message.success('登录成功');
        // 1.将登录成功的token保存到客户端的sessionstorage中
        //    1.1.项目中除了登录之外的其他api接口，必须在登录之后才能访问.
        //    1.2.token只应在当前网站打开期间生效，所以token保存在sessionStorage
        window.sessionStorage.setItem('token', res.data.token);
        // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background: white;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    height: 130px;
    width: 130px;
    border-radius: 50%;
    border: 1px solid #eee;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background: #eee;
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
}

</style>
